Abstract: The "pot cover effect" is an important phenomenon of water vapor migration in soils, which often occurs in the seasonal permafrost regions and causes many engineering diseases. Based on the current "pot cover effect" experiments and theoretical studies and unsaturated models for migration of soil moisture, considering the multiple influence factors, a one-dimensional "pot cover effect" gaseous water transport equation is proposed by using the PDV model. It is used to describe or predict the "pot cover effect" phenomenon, and the influences of the temperature and degree of saturation of soils on the "pot cover effect" of migration flux are investigated.